Abstract: A system for connecting a portable information equipment and an extension telephone, comprises: an extension telephone connecting device for connecting the portable information equipment to an extension telephone system after authentication through a virtual private network (VPN); and a Voice over Internet Protocol (VoIP) connecting device for connecting the portable information equipment connected to the extension telephone system to the extension telephone connected to the extension telephone system by VoIP. This system enables a temporary staff to make a call from outside to an extension telephone system in a dispatched company while maintaining security.

Abstract: A system for connecting a portable information equipment and an extension telephone, comprises: an extension telephone connecting device for connecting the portable information equipment to an extension telephone system after authentication through a virtual private network (VPN); and a Voice over Internet Protocol (VoIP) connecting device for connecting the portable information equipment connected to the extension telephone system to the extension telephone connected to the extension telephone system by VoIP. This system enables a temporary staff to make a call from outside to an extension telephone system in a dispatched company while maintaining security.

Abstract: A mobile station in a wires network communication system includes a measuring unit, a map database, a control unit and a communication unit. The measuring unit measures a present position of the mobile station using radio wave. The map database stores a map data, which includes an identifier to identify of each of a plurality of wireless LAN access points connected to a wireless communications network. Also, the map data includes a connection data to communicate with each wireless LAN access point and a position data indicating a setting position of each wireless LAN access point. The control unit refers to the map database based on the present position of the mobile station to choose an optimal wireless LAN access. The communication unit communicates with another station through the optimal wireless LAN access point based on the connection data of the optimal wireless LAN access point.